Hi Oz
Let me know how the T Rex goes. I had my eye on the 450 T Rex se model myself. Went to the hobby shop and ask the man what it would cost with all of the expensive electronics. (I was really drooling over it) He said somewhere in the ball park of $650.00 to set it up right to go inverted. Thought about how I could hide it from my wife !!! Then her wanting me to justified that much money for something so little. So I just gave up on it, for the time being anyway.
The 480 really has plenty of power, But as you know ( YOU CAN NEVER HAVE ENOUGH POWER) Wishing you the best of luck, Thomas